If you don't study kanji yet or you are studying kanji now, and when you want to read a japanese web-page but it's hard to read because having a lot of kanji, you can try the ひらがなめがね service on the internet.
The service insert hiragana above kanji (called furigana) in the page and show it.
1. open http://www.hiragana.jp/ with your browser.
2. input the url of the site you want to read to the input-box in the center of the page.
3. push "GO" button.